Surprising dyno results today--Vortech

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Finally got the G35 dyno'd after about 1200 miles on the Vortech SC with stock pulley and no other mods. Before any fine tuning, my engine pulled at 360 rwhp and 300 ft lbs torque. After tuning, which required just a bit of leaning out above 5800 RPM or so and minimal other touches (no changes to the factory SS box timing), the engine pulled 372 rwhp with 305 ft lbs torque. Furthermore, the torque curve was amazing flat, peaking out around 5200 but only coming down to 300 at redline. The HP curve was almost a straight line at 45 degrees right up to full power at redline. With the factory stock pulley, the blower made 8.7 lbs of boost at redline (6500).

What blew my mind was the almost perfect tune straight out of the box. Over about 5800 or so the AFR dropped to 10.8 and bringing it up to 11.5 added about 5 HP. I think Vortech has really got it right for the 2003 G35 coupe. My anxieties about having my engine flogged to redline over and over (about 8 pulls total) were needless. The engine happily screamed to redline, absolutely smooth as silk. If nothing else, the dyno'ing showed me I had been driving way too conservatively before.

My car was tested on a new generation Dynapack at Avalon Racing. The dyno was impressive--water cooled, computer controlled and simultaneously monitoring several functions including load at the rear wheel hubs. When the pedal is floored,the Dynapack takes over and controls the rate of RPM increase by varying the wheel resistance to keep everything totally smooth and the load constant. There are two units sitting on the floor that bolt onto the rear wheel hubs through a beefy connection on which the car sits (the car is jacked up a bit and then lowered down once the connections are tight). The readings were highly consistent from pull to pull.

I'll be receiving an e-mail of the charts and will post them when I get them.

Once again, these were amazing numbers with minimal fine tuning and a totally stock system.

 

So, does the f"actory SS setup" supplied with the Vortech pull timing, and that's what you stayed with? Or no timing pulled at all?

 

It does pull timing, I believe, but my tuner didn't touch that at all. There wasn't even a hint of pinging all the way up to redline and beyond (7200 on one pull) and at 8.7 lbs (on one of the pulls). If I never got the dynotune I don't think I would have noticed any difference, it was so close to perfect out of the box.

 

Man this is killin me! I want my chit to be perfect! Im started to think I should say fug the exhaust, high flo cats and just run this thing!

 

Actually, my mechanic was suggesting I get high flow cats and an aftermarket exhaust--but that would require a retune. I just don't have the need for it. I've already got enough power to get into big trouble (but that's just me).

 

Congrats. Glad to hear tune went well and you are definitely making solid power for just the Vortech. I have spent a lot on additional mods (headers, exhaust, plenum, etc.) and have just about the same power as you.

I have dyno tuned 3 or 4 sessions with Avalon on a Dynojet but have not seen/used the Dynapack setup yet. Avalon really likes it though and recommends we use it for my next tune. My only issue is I would rather use same dyno as other tunes for a consistant comparison of numbers.

Congrats again - enjoy!

~ Kevin

 

Doc, I have questions and comments for you. Can you call me. Too many to post and hope you get what I'm trying to say/ask.

310.818.1875

-Randy

 

By "DOC", I mean PAUL.

 

You can call me either as I am an ER doc. I will call you.

Paul

 

I'm going to give you the specific e-mail response Giles made to a similar question I asked him today. Also, attached are some graphs of my session. Dotted lines are before tune, solid after. I did about 8 pulls and the numbers were remarkably consistent.

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Hi Paul,
The numbers are wheel horsepower and torque. We used a correction ration of 1:1 instead of 1.21:1 hence giving us actually numbers at the wheel hubs. There is no parasitic loss factors etc. The numbers on the plot is exactly what was delivered to the dyno hubs. This is much more accurate and repeatable a reading since tyres heat, cool, deform and slip. I would say that the folks that are making 360 rwhp have poor tuning since yours is very mildly tuned. My dynapack is one of the latest generation of dynapacks that does not read high. If you check out some of the other plots on the website you will see that they are almost exactly the same as folks have been seeing on a DynoJet under ideal conditions. This number of accurate and repeatable and SAE adjusted on the dynapack.

It was great to meet you and it’s a very nice setup you have.

If you want any more combinations of graph just let me know.

Thanks again,
Giles

 

here are my DynaPack numbers